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Stockholders' Equity - AOCI and Noncontrolling Interest (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Change in accumulated other comprehensive income (loss) rollforward
Balances		$ 16,558.9
Purchase of subsidiary shares from noncontrolling interest	[1]	(18.1)	$ (1.4)	$ (0.6)
Balances		16,069.4	16,558.9
Change in redeemable noncontrolling interest rollforward
Redeemable noncontrolling interest, balance at beginning of period		255.6	264.9	391.2
Net income (loss) attributable to redeemable noncontrolling interest		17.5	7.5	33.6
Contributions from redeemable noncontrolling interest		166.8	136.2	402.1
Distributions to redeemable noncontrolling interest		(66.8)	(62.0)	(66.3)
Purchase of subsidiary shares from redeemable noncontrolling interest		(6.1)		(1.1)
Change in redemption value of redeemable noncontrolling interest		3.1	0.2	5.4
Other comprehensive income (loss) attributable to redeemable noncontrolling interest		(0.2)	0.6	5.3
Redeemable noncontrolling interest, balance at end of period		332.5	255.6	264.9
Redeemable noncontrolling interest of deconsolidated entities		(37.4)	(91.9)	(505.4)
Stock-based compensation attributable to redeemable noncontrolling interest			0.1	0.1
Accumulated other comprehensive income (loss)
Change in accumulated other comprehensive income (loss) rollforward
Balances		2,383.1	1,037.9	(1,565.1)
Other comprehensive income (loss) during the period, net of adjustments		(823.5)	1,329.2	2,518.6
Amounts reclassified from accumulated other comprehensive income (loss)		51.3	16.0	84.4
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.		(772.2)	1,345.2	2,603.0
Balances		1,610.9	2,383.1	1,037.9
Net unrealized gains (losses) on available-for-sale securities
Change in accumulated other comprehensive income (loss) rollforward
Balances		4,138.3	2,806.0	190.0
Other comprehensive income (loss) during the period, net of adjustments		(685.2)	1,416.7	2,578.3
Amounts reclassified from accumulated other comprehensive income (loss)		14.3	(40.3)	37.7
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.		(670.9)	1,376.4	2,616.0
Balances		3,467.4	4,138.3	2,806.0
Net unrealized losses on available-for-sale debt securities with allowance for credit losses		2.1	2.9
Net unrealized gains (losses) on available-for-sale securities | ASU 2016-13 - CECL | Effects of implementation of accounting change
Change in accumulated other comprehensive income (loss) rollforward
Balances		(44.1)
Balances			(44.1)
Noncredit component of impairment losses on fixed maturities available-for-sale
Change in accumulated other comprehensive income (loss) rollforward
Balances			(44.1)	(47.1)
Amounts reclassified from accumulated other comprehensive income (loss)				3.0
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.				3.0
Balances				(44.1)
Noncredit component of impairment losses on fixed maturities available-for-sale | ASU 2016-13 - CECL | Effects of implementation of accounting change
Change in accumulated other comprehensive income (loss) rollforward
Balances		44.1
Balances			44.1
Net unrealized gains (losses) on derivative instruments
Change in accumulated other comprehensive income (loss) rollforward
Balances		18.2	53.4	64.4
Other comprehensive income (loss) during the period, net of adjustments		53.7	(13.2)	8.0
Amounts reclassified from accumulated other comprehensive income (loss)		(20.1)	(22.0)	(19.0)
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.		33.6	(35.2)	(11.0)
Balances		51.8	18.2	53.4
Foreign currency translation adjustment
Change in accumulated other comprehensive income (loss) rollforward
Balances		(1,312.9)	(1,341.8)	(1,259.5)
Other comprehensive income (loss) during the period, net of adjustments		(270.0)	(7.3)	(102.7)
Amounts reclassified from accumulated other comprehensive income (loss)		19.3	36.2	20.4
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.		(250.7)	28.9	(82.3)
Balances		(1,563.6)	(1,312.9)	(1,341.8)
Unrecognized postretirement benefit obligations
Change in accumulated other comprehensive income (loss) rollforward
Balances		(460.5)	(435.6)	(512.9)
Other comprehensive income (loss) during the period, net of adjustments		78.0	(67.0)	35.0
Amounts reclassified from accumulated other comprehensive income (loss)		37.8	42.1	42.3
Other comprehensive income (loss) attributable to Principal Financial Group, Inc.		115.8	(24.9)	77.3
Balances		$ (344.7)	$ (460.5)	$ (435.6)
[1] Excludes amounts attributable to redeemable noncontrolling interest. See Note 13, Stockholders’ Equity, for further details.

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Amount, before tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) with allowance for credit loss.

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